index.css

html {
  --nuxeo-sidebar-background: #060606;
  --nuxeo-page-background: #f5f5f5;
  --nuxeo-app-header-background: #fff;
}

body {
  margin: 0;
}

nuxeo-app[unresolved] {
  display: block;
  position: absolute;
  width: 100%;
  height: 100%;
  filter: grayscale(100%);
}

[unresolved] #sidebar {
  background-color: var(--nuxeo-sidebar-background);
  width: 52px;
  height: 100%;
  float: left;
}

[unresolved] #sidebar img {
  width: 100%;
  animation: glow 1s infinite alternate;
}

[unresolved] #container {
  background-color: var(--nuxeo-page-background);
  float: left;
  width: calc(100% - 52px);
  height: 100%;
}

[unresolved] #toolbar {
  background-color: var(--nuxeo-app-header-background);
  width: 100%;
  height: 53px;
  box-shadow: 1px 0 0 rgba(0, 0, 0, 0.1) inset, 0 3px 5px rgba(0,0,0,0.1);
}

[unresolved] #loading {
  position: fixed;
  top: 45%;
  left: 50%;
}

[unresolved] #loading:after {
  overflow: hidden;
  display: inline-block;
  -webkit-animation: ellipsis steps(4,end) 1s infinite;
  animation: ellipsis steps(4,end) 1s infinite;
  content: '\2026'; /* ascii code for the ellipsis character */
  width: 0px;
  font-size: 64pt;
  font-family: 'Courier New';
  opacity: 0.2;
  line-height: 1em;
}

@keyframes glow {
  from {
    opacity: 1;
  }
  to {
    opacity: 0.4;
  }
}

@keyframes ellipsis {
  to {
    width: 48pt;
  }
}

@media (max-width: 720px) {
  [unresolved] #sidebar {
    display: none;
  }

  [unresolved] #container {
    width: 100%;
  }
}